fix(delegation): read task-local mode in getEnvironmentDetails and validateToolUse

[edelauna]

Related GitHub Issue

Closes: #1623

Description

A child task delegated to a different mode read the shared provider mode instead of its own task-local mode. Two readers diverged after PR #1494 removed handleModeSwitch from the delegation flow:

• getEnvironmentDetails reported the parent mode in the Current Mode block.
• validateToolUse received the parent mode and rejected tools the child mode allows.
• Custom tool execution in presentAssistantMessage passed the parent mode to the tool context.

All three now call cline.getTaskMode() instead of reading provider.state.mode.

Root cause: Before #1494, delegation switched the shared provider mode as a side effect, so both reader paths were accidentally correct. After #1494 switched to handoffExecutionContext, the two legacy readers were not updated.

Test Procedure

Unit tests:

pnpm vitest run src/core/environment/__tests__/getEnvironmentDetails.spec.ts
pnpm vitest run src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts

Lifecycle model check (includes new refinement script):

pnpm lifecycle:model-check

To reproduce the bug before this fix: start a task in orchestrator mode, delegate a child to code mode, and ask the child to use apply_diff. It fails with Tool "apply_diff" is not allowed in this mode.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Visual Snapshot (UI changes only): Not applicable.
• Documentation Impact: No documentation updates required.
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Additional Notes

Also adds scripts/check-delegated-mode-readers.ts to the lifecycle:model-check suite. The script verifies the read side of the mode invariant using only pure-TS imports — no VS Code dependency. It proves that orchestrator and code produce observably different tool-validation outcomes, so any future reader that uses the wrong source will fail the check.

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• src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts

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Require regression coverage at the lowest valid harness with behavior-focused assertions, including relevant negative, error, false/unset, and boundary cases.

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• src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts

Check strict typing and exhaustive behavior across normal, boundary, error, cancellation, retry, and compatibility paths.

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Files:

• src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts

Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.

⚙️ CodeRabbit configuration file

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• src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts

Act as an adversarial second-opinion reviewer.

⚙️ CodeRabbit configuration file

Files:

• src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts

🔇 Additional comments (2)

src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts (1)

126-170: LGTM!

src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts (1)

68-73: LGTM!

Also applies to: 324-351

---

📝 Summary

Summary by CodeRabbit

• Bug Fixes

  • Delegated tasks now validate and execute tools using their own mode rather than the parent task’s mode.
  • Environment details now display the correct mode for delegated tasks.
  • Added checks to prevent regressions in task-specific mode handling.

• Tests

  • Expanded coverage for tool usage, custom tools, images, unknown tools, and environment details across delegated modes.

Walkthrough

The change makes environment details, tool validation, and custom tool execution use each task’s stored mode. It adds regression tests and a lifecycle check for delegated mode handoffs.

Changes

Delegated mode readers

Layer / File(s)	Summary
Task-local mode readers and regression coverage src/core/assistant-message/..., src/core/environment/...	presentAssistantMessage and getEnvironmentDetails now call getTaskMode(). Tests verify behavior when provider and task modes differ, including custom tool execution and missing provider state.
Delegated mode verification scripts/check-delegated-mode-readers.ts, package.json	The new script checks stored handoff modes, divergent tool permissions, and all built-in delegation targets. lifecycle:model-check runs the script.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to ad057

Delegated tasks now use their own mode for environment reporting, validation, and custom-tool execution, with regression coverage for differing parent and child modes. The change is ready to merge.

🚥 Pre-merge checks | ✅ 8

✅ Passed checks (8 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes satisfy the coding requirements in [#1623]. getEnvironmentDetails reads the task-local mode for Current Mode. presentAssistantMessage passes the task-local mode to validateToolUse …
Out of Scope Changes check	✅ Passed	All changed files support [#1623]. Production changes fix the stale shared-mode readers. Test changes provide required task-mode fixtures and regression coverage. The verification script and package s…
Regression Evidence	✅ Passed	All changed runtime behaviors have focused unit coverage. getEnvironmentDetails tests a divergent provider/task mode and verifies the emitted <slug> and getFullModeDetails input. `presentAssista…
Security Boundaries	✅ Passed	No changed path meets the security failure conditions. presentAssistantMessage.ts now supplies the task-local mode, but it still calls validateToolUse before execution and preserves `disabledTools…
Persistence Integrity	✅ Passed	No changed persistence path exists. The PR changes only mode reads in presentAssistantMessage and getEnvironmentDetails, and adds tests plus a verification script. These paths await `cline.getTask…
Lifecycle Resource Cleanup	✅ Passed	No changed path meets the failure condition. The new lifecycle check only performs synchronous assertions, structuredClone calls through selectHandoffExecutionContext, and logging; it does not cre…
Title check	✅ Passed	The title clearly identifies the main delegation fix and names the two primary affected readers.
Description check	✅ Passed	The description covers the linked issue, root cause, implementation, test procedure, checklist, and additional verification details. Some optional template sections, including Videos, Visual Snapshots…

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue/1623

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✅ All modified and coverable lines are covered by tests.

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Actionable comments posted: 1

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Inline comments:
In
`@src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts`:
- Line 80: Add a dedicated custom-tool execution test using distinct provider
and task modes, then assert that customTool.execute receives the task-local mode
in its context. Keep the assertion behavior-focused and place it in the existing
presentAssistantMessage test harness.

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📥 Commits

Reviewing files that changed from the base of the PR and between c6eb8fb and 2801d66.

📒 Files selected for processing (9)

• package.json
• scripts/check-delegated-mode-readers.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-images.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-unknown-tool.spec.ts
• src/core/assistant-message/presentAssistantMessage.ts
• src/core/environment/__tests__/getEnvironmentDetails.spec.ts
• src/core/environment/getEnvironmentDetails.ts

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📓 Path-based instructions (4)

Require regression coverage at the lowest valid harness with behavior-focused assertions, including relevant negative, error, false/unset, and boundary cases.

⚙️ CodeRabbit configuration file

Files:

• src/core/assistant-message/__tests__/presentAssistantMessage-images.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-unknown-tool.spec.ts
• src/core/environment/__tests__/getEnvironmentDetails.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts

Check strict typing and exhaustive behavior across normal, boundary, error, cancellation, retry, and compatibility paths.

⚙️ CodeRabbit configuration file

Files:

• src/core/assistant-message/__tests__/presentAssistantMessage-images.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-unknown-tool.spec.ts
• src/core/environment/getEnvironmentDetails.ts
• src/core/assistant-message/presentAssistantMessage.ts
• src/core/environment/__tests__/getEnvironmentDetails.spec.ts
• scripts/check-delegated-mode-readers.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts

Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.

⚙️ CodeRabbit configuration file

Files:

• src/core/assistant-message/__tests__/presentAssistantMessage-images.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-unknown-tool.spec.ts
• src/core/environment/getEnvironmentDetails.ts
• src/core/assistant-message/presentAssistantMessage.ts
• src/core/environment/__tests__/getEnvironmentDetails.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts

Act as an adversarial second-opinion reviewer.

⚙️ CodeRabbit configuration file

Files:

• src/core/assistant-message/__tests__/presentAssistantMessage-images.spec.ts
• package.json
• src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-unknown-tool.spec.ts
• src/core/environment/getEnvironmentDetails.ts
• src/core/assistant-message/presentAssistantMessage.ts
• src/core/environment/__tests__/getEnvironmentDetails.spec.ts
• scripts/check-delegated-mode-readers.ts
• src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts

🔇 Additional comments (4)

src/core/assistant-message/presentAssistantMessage.ts (1)

347-350: LGTM!

Also applies to: 623-623, 930-930

src/core/assistant-message/__tests__/presentAssistantMessage-images.spec.ts (1)

60-60: LGTM!

src/core/assistant-message/__tests__/presentAssistantMessage-tool-usage-attribution.spec.ts (1)

76-76: LGTM!

Also applies to: 119-119, 321-358

src/core/assistant-message/__tests__/presentAssistantMessage-unknown-tool.spec.ts (1)

63-63: LGTM!